Rare Modern US No Mint Mark Proof Coins
By Bullion Shark LLC ...... Modern Proof coins that were struck at the San Francisco Mint, as most Proof coinage has been since 1968, normally bear an “S”
Source: coinweek.com
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By Bullion Shark LLC ...... Modern Proof coins that were struck at the San Francisco Mint, as most Proof coinage has been since 1968, normally bear an “S”